List of plugins I usually use to develop sites
Regenerate the thumbnails for one or more of your image uploads. Useful when changing their sizes or your theme.
Simple automated backups of your WordPress-powered website.
Make WordPress migration easy. Migrate your database at the click of a button with full support for serialized data.
Edit the permalink of custom post type.
Adds a debug menu to the admin bar that shows query, cache, and other helpful debugging information.
Query Monitor is the developer tools panel for WordPress.
Adds a PHP/MySQL console to the debug bar. Requires the debug bar plugin.
Making sense of the rewrite mess. Display and play with your rewrite rules.